成都市近地表大气尘的地球化学特征

通过对成都市近地表大气尘矿物组成、化学成分的分析,查明了成都市近地表大气尘矿物、元素的含量和空间分布特征。近地表大气尘主要矿物成分为石英、长石、伊利石、白云石,方解石。石膏等;近地表大气尘中重金属高值区主要在二环路内、黄田坝、琉璃厂和城东老工业区,部分元素呈明显污染郊区化趋势。与国内外其它城市街道灰尘及大气颗粒物重金属含量比较,总体上重金属含量相当,个别元素接近重工业城市水平。

THE GEOCHEMICAL CHARACTERISTICS OF AIR DUST NEAR THE GROUND IN CHENGDU

Studies of mineral and chemical composition revealed the content and spatial distribution of minerals and elements in air dust near the ground from Chengdu. The air dust was composed of quartz, feldspar, illite, dolomite, calcite, gypsum, etc; the higher-level regions of heavy metals are within zone Ⅱ, Huangtianba, Liulichang and the old industrial park. The pollution caused by a few elements trend expands toward suburbs obviously. Comparing its contents with those of street dust or air particles of international cities, we found that the contents of heavy metals in air dust near the ground are close to those of other cities, and few specific elements' contents are close to those of heavy industrial cities .